Bests & Worsts Reviews from Amazon

My CyberPower CP1350PFCLCD PFC Compatible 1350VA 810W Pure Sine Wave Tower UPS arrived today in perfect condition and I immediately put it to the test with my oscilloscope monitoring the output under load (my Dell XPS 9000 computer and LCD monitor). I was thrilled to see a nice smooth sine wave output when running on battery power which was not the case with a Tripp Lite model G1010USB that claimed to have a "PWM sine wave" output but instead was a stepped square wave and my computer refused to run with that UPS. If you have a modern computer and it won't work with the cheaper UPS backup supplies when the power fails it is most likely because your computer has a PFC type power supply which WILL NOT WORK on any type of waveform other than a pure sine wave! Some people complain that they wish the battery capacity was higher so they can run on battery power for tens of minutes if not an hour but the purpose of ANY UPS in this catagory is to allow the user to safely close their open files and shut down the computer in a matter of a few minutes, not power it for tens of minutes or longer. If you need extended time emergency backup power then you'll need either a backup generator or a bank of batteries running an inverter to supply power to your load. I have posted a photo of the sine wave output from my CyberPower CP1350PFCLCD PFC Compatible 1350VA 810W UPS when it's running on battery power only and supplying about 175W to 200W of power to my computer and monitor. The waveform was smooth and actually had less distortion than what is coming out of my wall outlet! Unlike some reviews from a year ago, there was no smell coming from the unit when I unpacked it and no smell when running so if that was a problem in the past they must have fixed it. The only thing I wish were different is the lack of ability to keep the display backlight on (it goes off after several seconds when the front panel button is pushed - probably to save energy). I highly recomend this product - especially if you are looking for a UPS that produces a true sine wave output for your computer's PFC power supply requirement. May 21, 2012 - This is a follow up to my original posting. The UPS is still running great and I got a response from the manufacturer about how to keep the display light on constantly. "You can configure the LCD to stay ON at all times by pressing the DISPLAY button for 2 seconds until you hear a short beep. This will configure the display to stay on at all times." CyberPower CP1350PFCLCD PFC Compatible 1350VA 810W Pure Sine Wave Tower UPS